Transmitter and receiver for a wireless audio transmission system
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a transmitter for a wireless audio transmission system comprising at least one analog/digital converter unit for analog/digital conversion of the analog audio signals to be transmitted, at least one digital signal processing unit with a compressing/encoding device for compressing and encoding the digitized signal to be transmitted, a digital/analog converter unit for digital/analog conversion of the digital output signals of the digital signal processing unit into analog signals, and a transmitting unit for wirelessly transmitting the output signals of the digital/analog converter unit. There is further provided a receiver for a wireless audio transmission system comprising a receiving unit for receiving wirelessly transmitted analog HF signals, an intermediate frequency unit for mixing the HF signals onto intermediate frequency signals, at least one analog/digital converter unit for analog/digital conversion of the wirelessly received signals, at least one digital signal processing unit with an expanding/decoding device for expanding and decoding the signals digitised by the at least one analog/digital converter unit, and at least one digital/analog converter unit for converting the digital output signals of the digital signal processing unit into analog signals.
24 Citations
48 Claims
-
1-24. -24. (canceled)
-
25. A transmitter for a wireless audio transmission system comprising:
-
at least one analog/digital converter unit for analog/digital conversion of the analog audio signals to be transmitted; at least one digital signal processing unit with a compressing/encoding means for compressing and encoding the digitized signal to be transmitted; a digital/analog converter unit for digital/analog conversion of the digital output signals of the digital signal processing unit into analog signals; and a transmitting unit for wirelessly transmitting the output signals of the digital/analog converter unit. - View Dependent Claims (26, 27, 28, 29, 30, 31)
-
-
32. A receiver for a wireless audio transmission system comprising:
-
a receiving unit for receiving wirelessly transmitted analog HF signals; an intermediate frequency unit for mixing the HF signals onto intermediate frequency signals; an analog/digital converter unit for analog/digital conversion of the wirelessly received signals; a digital signal processing unit with an expanding/decoding means for expanding and decoding the signals digitized by the analog/digital converter unit; and at least one digital/analog converter unit for converting the digital output signals of the digital signal processing unit into analog signals. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
-
-
40. A wireless audio transmission system comprising:
-
a transmitter for a wireless audio transmission system, said transmitter comprising; at least one analog/digital converter unit for analog/digital conversion of the analog audio signals to be transmitted; at least one digital signal processing unit with a compressing/encoding means for compressing and encoding the digitized signal to be transmitted; a digital/analog converter unit for digital/analog conversion of the digital output signals of the digital signal processing unit into analog signals; a transmitting unit for wirelessly transmitting the output signals of the digital/analog converter unit; and a receiving unit for receiving wirelessly transmitted analog HF signals, said receiver comprising; an intermediate frequency unit for mixing the HF signals onto intermediate frequency signals; an analog/digital converter unit for analog/digital conversion of the wirelessly received signals; a digital signal processing unit with an expanding/decoding means for expanding and decoding the signals digitized by the analog/digital converter unit; and at least one digital/analog converter unit for converting the digital output signals of the digital signal processing unit into analog signals.
-
-
41. A digital compressor for a digital compander apparatus comprising:
a filter bank for dividing an input signal into different frequency bands; at least one multiplier unit for multiplying the different frequency bands of the input signal by weighting factors; a sum filter bank for combining the output signals of the multiplication units to afford a filter bank total signal; and an addition unit for adding the input signal to the filter bank total signal to obtain an output signal. - View Dependent Claims (42, 44)
-
43. A digital expander for a digital compander apparatus comprising:
-
a filter bank for dividing an output signal into different frequency bands; at least one multiplier unit for multiplying the different frequency bands of the output signal by weighting factors; a sum filter bank for combining the output signals of the multiplication units to afford a filter bank total signal; and an addition unit for subtracting the filter bank total signal output signal from the input signal to obtain an output signal.
-
-
45. A digital compressor for a digital compander apparatus comprising:
-
a time-variant filter unit for time-variant filtering of an input signal; and an addition unit for adding the output signal of the time-variant filter unit to the input signal to obtain an output signal.
-
-
46. A digital compressor for a digital compander apparatus and further comprising:
-
spectral estimation unit for carrying out spectral estimation of the output signal; and a filter coefficient calculating unit for calculating the coefficients of the time-variant filter unit based on the spectral estimation of the spectral estimation unit.
-
-
47. A digital expander for a digital compander apparatus comprising:
a time-variant filter unit for time-variant filtering of an output signal; and an addition unit for subtracting the output signal of the time-variant filter unit from the input signal to obtain an output signal.
-
48. A digital expander for a digital compander apparatus and further comprising:
-
a spectral estimation unit for carrying out spectral estimation of the input signal; and a filter coefficient calculating unit for calculating the coefficients of the time-variant filter unit based on the spectral estimation of the spectral estimation unit.
-
Specification